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• Algorithms for Data Redundancy and Failover for distributed storage system?

  - by kennetham

  I'm building a distributed storage system that works with different storage sizes. For instance, my storage devices have sizes of 50GB, 70GB, 150GB, 250GB, 1000GB, 5 storage systems in one system. My application will store any files to the storage system. Question: How can I build a distributed storage with the idea of data redundancy and fail-over to store documents, videos, any type of files at the same time ensuring that should one of any storage devices fail, there would be another copy of these files on another storage device. However, the concern is, 50GB of storage can only store this maximum number of files as compared to 70GB, 150GB etc. With one storage in mind, bringing 5 storage systems like a cloud storage, is there any logical way to distribute or store the files through my application? How do I ensure data redundancy through different storage sizes? Is there any algorithm to collate multiple blob files into a single file archive? What is the best solution for one cloud storage with multiple different storage sizes? I open this topic with the objective of discussing the best way to implement this idea, assuming simplicity, what are the issues of this implementation, performance measurements and discussion of the limitations.

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• Project specific help [closed]

  - by Sushant Jain

  Hi friends, I am in final year of engineering with Information Technology branch. I have to make my final year project based on Linux/UNIX platform. But until now i couldn't find any good project idea that will be useful for my future industrial career also. So please help me if you have any good project idea related to any field in Linux that gives us a leading edge in my career. and please suggest me sources that will be helpful to me in making that project. Thanks in advance.....

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• How do you plan your asynchronous code?

  - by NullOrEmpty

  I created a library that is a invoker for a web service somewhere else. The library exposes asynchronous methods, since web service calls are a good candidate for that matter. At the beginning everything was just fine, I had methods with easy to understand operations in a CRUD fashion, since the library is a kind of repository. But then business logic started to become complex, and some of the procedures involves the chaining of many of these asynchronous operations, sometimes with different paths depending on the result value, etc.. etc.. Suddenly, everything is very messy, to stop the execution in a break point it is not very helpful, to find out what is going on or where in the process timeline have you stopped become a pain... Development becomes less quick, less agile, and to catch those bugs that happens once in a 1000 times becomes a hell. From the technical point, a repository that exposes asynchronous methods looked like a good idea, because some persistence layers could have delays, and you can use the async approach to do the most of your hardware. But from the functional point of view, things became very complex, and considering those procedures where a dozen of different calls were needed... I don't know the real value of the improvement. After read about TPL for a while, it looked like a good idea for managing tasks, but in the moment you have to combine them and start to reuse existing functionality, things become very messy. I have had a good experience using it for very concrete scenarios, but bad experience using them broadly. How do you work asynchronously? Do you use it always? Or just for long running processes? Thanks.

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• Silverlight, JavaScript and HTML 5 - Who wins?

  - by Sahil Malik

  SharePoint 2010 Training: more information   Disclaimer: These are just opinions. In the past I have expressed opinions about the future of technology, and have been ridiculously accurate. I have no idea if this will be accurate or not, but that is what it’s all about. Its opinions, predicting the future.   This topic has been boiling inside me for a while, and I have discussed it in private gettogethers with fellow minded techies. But I thought it would be a good idea to put this together as a blogpost. There is some debate about the future of Silverlight, especially in light of technologies such as newer faster browsers, and HTML 5. As a .NET developer, where do I invest my time and skills – remember you have limited time and skills, and not everything that comes out of Microsoft is a smashing success. So it is very very wise for you to consider the facts, macro trends, and allocate what you have limited amounts of – “time”. Read full article ....

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• Rolling desktop recorder?

  - by lance

  I want a piece of software that will constantly record what I'm doing on my desktop, discarding footage that's over [30] seconds old. Its recording would be a rolling one. The idea is that I can somehow hit a button and see "what just happened". I don't want to have to babysit it. That is, I don't want a piece of software designed for screencasting (which I'm not trying to do). My bias against that is based on my (maybe incorrect?) assumption that I'd regularly have to start/stop the recording throughout the day. The idea is that this piece of software would consume fewer resources (than a screencast recorder) on my box, as it's only keeping a very limited amount of footage in memory (and low quality would even be acceptable), because it's discarding frames fairly quickly after they're captured. Where can I find a piece of software with features like this?

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• What individual needs to be aware when signing a NDA with client?

  - by doNotCheckMyBlog

  I am very new to IT industry and have no prior experience. However I came into contact with a party who is gear to build a mobile application. But, they want me to sign NDA (No Disclosure Agreement). The definition seems vague, The following definitions apply in this Agreement: Confidential Information means information relating to the online and mobile application concepts discussed and that: (a) is disclosed to the Recipient by or on behalf of XYZ; (b) is acquired by the Recipient directly or indirectly from XYZ; (c) is generated by the Recipient (whether alone or with others); or (d) otherwise comes to the knowledge of the Recipient, When they say otherwise comes to the knowledge of the recipient. Does it mean if I think of any idea from my own creative mind and which is similar to their idea then it would be a breach of this agreement? and also is it okay to tell to include application name in definition as currently to me it sounds like any online of mobile application concept they think I should not disclose it to anybody. "Confidential Information means information relating to the online and mobile application concepts discussed and that:" I am more concerned about this part, Without limiting XYZ’s rights at law, the Recipient agrees to indemnify XYZ in respect of all claims, losses, liabilities, costs or expenses of any kind incurred directly or indirectly as a result of or in connection with a breach by it or any of its officers, employees, or consultants of this Agreement. Is it really common in IT industry to sign this agreement between client and developer? Any particular thing I should be concerned about?

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• SQL Server Database Recovery

  - by user250545

  do u have any idea , which is the best software or best way to recover corrupt database in sql 2000/2005/2008

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• New: Online NetBeans 8 Crash Course

  - by Geertjan

  On Twitter today I came across an announcement for a brand new on-line course in NetBeans 8. Since NetBeans 8 has been released during the past few months, the course is really very new. Go here to get there directly: https://www.video2brain.com/de/videotraining/netbeans-ide-8-0-crashkurs Here's the general idea. As you can see, the course is in German. With my basic understanding of German, I've had no problem in following the course. The trainer speaks clearly and slowly and everything is very well structured. The course covers all the basics of NetBeans IDE. From getting set up to using all the key features. The quality of the videos is great and the content is clear and informative. Once you've bought the course, all the lessons are unlocked. As you can see, they're all quite short and there's really a lot of content, didn't all fit into the screenshot: Quite some work must have gone into this. Here's one of the free lessons in the course, to give an idea of what you'll get: https://www.video2brain.com/de/tutorial/texte-internationalisieren This one is also free: https://www.video2brain.com/de/tutorial/eclipse-projekt-importieren I highly recommend this course especially if you're switching, or thinking about switching, from a different IDE and want to get a thorough overview of all the features that NetBeans IDE provides. Everything in the course is done within NetBeans, which means no slides, just code. You get to see the workflow of all the standard tasks and, for these purposes, the course does a really great job.

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• Updated 12.04 and now Xorg is dead from NVidia drivers

  - by Xatolos

  I updated (August 16) Ubuntu 12.04 today and while I admit I didn't look what was being updated, it was large enough to have had an NVidia update in it. Problem is later on when I turned on my laptop again it won't boot into a GUI, just to the terminal (which I don't really know much of how to do anything). Now I have been able to log in and type "startx" to start up the GUI and now its complaining that my NVidia driver (if I remember correctly) is listed as being version 304.(number) and the version installed/found is version 295.(number). I don't know how this happened and now I'm stuck. I have no idea how it happened and don't know how to fix. Does anyone have any ideas? I have only access to wifi internet and no idea how to log on without the GUI so getting a new NVidia package isn't something I would know how to do even... Any and all help would be highly appreciated. edit: If it helps, I'm using a ASUS G Series G53JW-A1 http://www.newegg.com/Product/Product.aspx?Item=N82E16834220861

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• How to convince non-programmer his notions about computers are wrong?

  - by Suma

  Recently I came across a question about 64b on SuperUser for which the accepted answer seemed like a complete nonsense to me. I made two comments pointing out obvious mistakes. To my perplexion, the comments had an effect of the poster of the answer being alienated. I have no idea how could I convince him he is wrong, as he does not seem to understand the basics of the problem. He seems to be mixing concepts like bus size and address size - see the pearl sentence "it will allow you to address all of your RAM because your processor is reading from your RAM in 64 bit words.". The poster asks me to provide proves of my claim by quoting a respectable source, but I have no idea where to find such source, as I doubt anything I would consider relevant would be relevant for him (it would be probably too technical). I think this instance can serve as an illustration of communication problems between programmers and users (and to certain extent even to any expert vs. non-expert communication). How should a programmer handle a communication like this, so that is does not become a useless quarrel?

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• HUGE MAC FILTER and scripting

  - by user195917

  I make an dhcp server on CentOS, and i apply a mac filter for my clients. Now, with a small number of clients (max 10) ,is not that hard, but what I will do with 2000 clients? My idea was to create a list (ex. "macfilter.lst") and this list, to be updated after a database. I have tow questions. First: How do i create a filter in IPTABLES that takes info`s from a file (file hosted on server) Second: Any idea about how to write a script, that update a file after a database?? Thanks so much for your help.

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• Kubuntu never gets to the login screen

  - by searchfgold6789

  I am not sure if Xorg is using the right device... The system in question is an A4-1400 CPU with built-in Radeon Graphics. I added a PCIe Radeon HD 5750, and changed the BIOS so it would use that card automatically. Now it appears that I can see output from the TV plugged into the HDMI port, and boot into recovery mode, but cannot get to a desktop - X doesn't start. It just freezes at the Kubuntu splash screen. I have no idea how to get X to use the proper graphics card. I pasted the Xorg.log to http://paste.ubuntu.com/6261137/. And the Xorg.conf generated by aticonfig --initial is at http://paste.ubuntu.com/6261161/ Also, see lspci and lshw -c display outputs. I can provide more information, but something does tell me X is not using the right graphics card and I've no idea where to begin how to fix it... I faced a similar issue before with another distribution but found no information anywhere on how to make X use a specific graphics card. Or maybe it's not that simple.

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• Is there a free program that can detect which device on my network is causing lag?

  - by malfy

  I'm on a small business network, and rarely we experience really extreme latency. I have no idea what device might be causing the lag, and wanted to know if there was a piece of software that could detect it. I know about some softwares like wireshark, which maybe do what I'm asking? If so it's too complicated to understand. I run the program and I have no idea what I'm looking at, or what parameters to give it. So something that can monitor traffic, as well as describe it in such a way that even a not so network savvy individual can interpret.

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• How can I prevent my computer from waking up accidentally?

  - by Ivo Flipse

  When I put my computer into sleep mode, it will wake up while I'm away from it. There's nothing near the computer that could move the mouse or accidentally press a button and I have no idea what might be causing it. I tried checking what woke it, apparently LASTWAKE only tells me that it has been in sleep mode, not what woke it up. I also couldn't find anything in my Power Options regarding Sleep that seems off. Poking around in the Event Viewer I notice the following: The Power-Troubleshooter event at the top notes the following: The system has returned from a low power state. Sleep Time: ?2012?-?10?-?27T11:31:53.408927000Z Wake Time: ?2012?-?10?-?27T12:25:51.887029300Z Wake Source: Unknown So does anyone have an idea to find out what might be causing it and how I can prevent my computer from randomly waking up?

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• Could I replace a stock PSU fan with a more quiet one?

  - by GaryJL

  I have a cheap 450W PSU with an exhaust fan at the rear. This fan, however, is very loud. Is it a good idea to replace the stock PSU fan with a quiet fan with similar airflow? The PSU fan is hard-wired to the PCB in the PSU so I was intending on snipping the stock fan wires and sealing the loose ends with electrical tape. I would then connect the new quiet fan to the PWR_FAN socket on the motherboard. Has anyone done this before themselves? Is it a good idea in the first place? Considering if my PSU fails, it could take out a couple of other components too.

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• Have there been attempts to make object containers that search for valid programs by auto wiring compatible components?

  - by Aaron Anodide

  I hope this post isn't too "Fringe" - I'm sure someone will just kill it if it is :) Three things made me want to reach out about this now: Decoupling is so in the forefront of design. TDD inspires the idea that it doesn't matter how a program comes to exist as long as it works. Seeing how often the adapter pattern is applied to achieve (1). I'm almost sure this has been tried from a memory of reading about it around the year 2000 or so. If I had to guess, it was maybe about and earlier version of the Java Spring framework. At this time we were not so far from days when the belief was that computer programs could exhibit useful emergent behavior. I think the article said it didn't work, but it didn't say it was impossible. I wonder if since then it has been deemed impossible or simply an illusion due to a false assumption of similarity between a brain and a CPU. I know this illusion existed because I had an internship in 1996 where I programmed neural nets that were supposedly going to exhibit "brain damage". STILL, after all that, I'm sitting around this morning and not able to shake the idea that it should be possible to have a method of programming to allow autonomous components to find each other, attempt to collaborate and their outputs evaluated against a set desired results.

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• Recovering from backup without original install media

  - by KGendron

  A machine from my old job had a complete hard drive failure. I have backups but I'm running into severe problems restoring from them. The only install media was a secondary restore partition on the system's hard drive. I hate whoever came up with that idea more than i can possibly express with words. I spent several days trying to recover the disk - it is pretty well shot and none of my best tricks could even get it to show up in the bios/ The machine that broke is an hp with xp media center edition on it (I don't know why either). The backups were created using the default windows backup tool - I have .bfk file on an external hardrive that i am trying to restore from. I've replaced the hard drive. My home machine is running windows 7 64bit and i'm trying to use it as a platform to restore to the other disk. I downloaded the window 7 nt-restore utility, however no matter what i do it restores to my C drive rather than the specified drive. Fortunately win7 security settings prevented it from being a complete disaster - but still not a happy thing. I tried firing up the xp virtual machine. I can browse to the backups but it says they are invalid and refuse to let me view/ continue with the restore. I tried installing XP to an extra harddrive on my machine - however it bluescreens on me during the install process and I cry. I tried installing xp pro to the new drive and attempted to restore over it, it of course blackscreened on me as that was a stupid idea. I made two partitions on the new hard drive (Apparently the bios on this accursed piece of junk doesn't allow hd partitions larger than 200G anyways and thus fails 40 minutes into the install with an ever-descriptive "Disk Read Error". Guess how i spent last weekend? My last idea was to install xp pro to the second partition and then use it to restore from backup to the first. After the first restart it gives me the error "Windows could not start because of a computer disk hardware configuration problem. Could not read from the selected boot disk. Check boot path and disk hardware". My brain made one of those bad hard drive clicky noises. I've tried several boot disks but they don't seem to work. If anyone has a link to a good one it would be greatly appreciated. Anyone have any more ideas? - I really hate asking on what seems like such a simple issue but i am quite literally at my wit's end. Thanks - and sorry for the really long post.

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• Bug: unable to handle kernel NULL pointer dereference at

  - by maria

  I have recently installed new system on my disc, Ubuntu 12.04. Installation proceeded without problems, I started installing additional software and put data from other discs. I had already two times bug report, it was quite long, and I have no idea how to acces to log file (which probably is somewhere saved) and since I had to switch off the computer using the button, anything else was possible, here is just a small part of it (what I've noted on paper) could not write bytes: Broken pipe speach dicpatcher disabled: edit etc/default/speach-dispatcher saned disabled: edit .... and than: BUG: unable to handle kernel NULL pointer dereference at 0000009c I've run Memory test in GRUB, everything is fine. First time it occured when I was using rsync, second time when I was trying to install texlive. Should I install whole system once again? Or can it be hardware problem? Or something else? If there is any hardware details which may be relevant, please ask, since I have no idea what is happening, I don't know what kind of information could be useful. Thanks P.S. dmesg output:

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• Mahout - Clustering - "naming" the cluster elements

  - by Mark Bramnik

  I'm doing some research and I'm playing with Apache Mahout 0.6 My purpose is to build a system which will name different categories of documents based on user input. The documents are not known in advance and I don't know also which categories do I have while collecting these documents. But I do know, that all the documents in the model should belong to one of the predefined categories. For example: Lets say I've collected a N documents, that belong to 3 different groups : Politics Madonna (pop-star) Science fiction I don't know what document belongs to what category, but I know that each one of my N documents belongs to one of those categories (e.g. there are no documents about, say basketball among these N docs) So, I came up with the following idea: Apply mahout clustering (for example k-mean with k=3 on these documents) This should divide the N documents to 3 groups. This should be kind of my model to learn with. I still don't know which document really belongs to which group, but at least the documents are clustered now by group Ask the user to find any document in the web that should be about 'Madonna' (I can't show to the user none of my N documents, its a restriction). Then I want to measure 'similarity' of this document and each one of 3 groups. I expect to see that the measurement for similarity between user_doc and documents in Madonna group in the model will be higher than the similarity between the user_doc and documents about politics. I've managed to produce the cluster of documents using 'Mahout in Action' book. But I don't understand how should I use Mahout to measure similarity between the 'ready' cluster group of document and one given document. I thought about rerunning the cluster with k=3 for N+1 documents with the same centroids (in terms of k-mean clustering) and see whether where the new document falls, but maybe there is any other way to do that? Is it possible to do with Mahout or my idea is conceptually wrong? (example in terms of Mahout API would be really good) Thanks a lot and sorry for a long question (couldn't describe it better) Any help is highly appreciated P.S. This is not a home-work project :)

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• I want to make my Application Open Source, but I'm unsure...

  - by Joern

  Hi! I have written a website, which is my big idea. Now I'm planning a version for intranets. The big question in my head is: "shall I make it open source?" and next are: What do I have to prepare What do I need for a good start What is the best way to find people with the same interests Who gives me the proof that I won't find a copy of my idea on another page, stolen from my open source code Please Discuss with me, give some good arguments pro and contra. Yours, Joern.

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• How do I create an efficient long, pannable, sprite-animated scene in a Windows Store game?

  - by Groo

  I am creating my first Windows Store application in XAML, and I cannot seem to find a proper example for the requirements I have. The basic idea of the app is to have a large scrollable canvas which would lazily start animating visible parts of the view as soon as user stops panning over a certain content (with some audio played also): My original idea was to use a StackPanel to add a bunch of custom controls, each of which would then animate itself once visible (with a short delay), but I have a couple of concerns: If the entire canvas is ~50 screen widths wide, is it feasible to load all content at the beginning, or do I need to plan doing some lazy loading during scrolling? For example, when I select a certain region in the Bing Travel app, it seems to lazily load tiles as I scroll it towards the end. Since content is stretched 100% vertically, and these animations are vectorized to be resolution independent, I am not sure if XAML (CompositionTarget) will be able to handle this, or I have to go for DirectX (MonoGame or C++) to get rid of flicker. Even better, is there an example for Windows 8 which uses a 100% vertically sized GridView with custom animated controls inside?

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• DH61AG's mythical 2 pin 19v power socket and is too low of votage bad?

  - by Nick Orton

  I have an intel dh61ag motherboard. It has an external 19v power adapter. It also has a 1x2 pin 19VDC internal power connector. Now I cannot find a psu or adapter or anything that will plug into this. In an intel forum, one person said that he plugged half of a 2x2 psu connector in and it worked. Since this would deliver 12v into a socket that asks for 19v, I suspect that this is a bad idea. I don't know much about hardware. Can anyone explain to me why this would be a bad idea?

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• IIS configuration to publish files

  - by Andy.l

  I have a web service that will save a file that will be published externally through IIS. The idea was to use Webdav to save the file, but that would mean that the file could be altered externally as well. The idea is to have 2 website on the IIS server that I publish the file from. One site http://internalpublish.local/vfolder where vfolder points to a file share where the file would be saved through webdav. The other site would be http://externalpublish.com/vfolder where vfolder points to the same physical folder as on the internal site, but webdav is NOT enabled on this site. Would this cause any issues? Any feedback would be gratefully appreciated. /Andy.l

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• How to setup a daily report of the top e-mail senders in Exchange 2010

  - by Belmin

  We have had issues with compromised Exchange accounts sending a large amount of unsolicited e-mails out. We have mitigated this by using a cloud e-mail gateway that does a better job in detecting these outgoing messages as to not hurt our e-mail reputation. However, we would still like to detect any abnormal e-mail activities. One idea is a report of the Exchange accounts with the most outgoing message. Any idea on how to do this? Or a similar stat that may be indicative of an account being compromised?

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• VirtualBox or else programs to run Mac OS virtually on Windows 7

  - by blgnklc

  any idea will help me to enlarge the boundaries surround me nowadays. regards

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